[Tile-serving] [openstreetmap/osm2pgsql] Add unique constraint for geometry tables (#873)

[Michael Reichert]

Many users don't need a unique ID column and would be bothered by it because it wastes a lot of space for a useless number.

`osm_id` is not unique if you import without `--multi-geometry` because osm2pgsql then splits up multipolygon (OGC term here) geometries into simple polygon geometries.

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